The westbound lane of the Congers Road causeway in Clarkstown was closed Thursday afternoon after a violent storm broke two utility poles. (Akiko Matsuda/The Journal News)

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Utility crews worked to repair storm damage in Rockland and Westchester counties Friday, a day after intense thunderstorms rolled through the region, causing more than 18,000 homes and businesses to lose power.

Service was restored to most utility customers by Friday, but by 6 p.m., about 200 Tarrytown and Port Chester customers in Westchester and 100 Orangetown, Clarkstown, Haverstraw and Ramapo customers in Rockland remained without power.

Those still without service will likely have their electricity restored by Saturday morning, Consolidated Edison and Orange and Rockland ...